UTICA BOILERS MGB Series User's Information Manual page 6

The boiler fl ue gas passageways may be inspected by
a light and mirror. Remove the burner door. Place a
trouble lamp in the fl ue collector through the draft relief
opening. With the mirror positioned above the burners,
the fl ue gas passageways can be checked for soot or
scale. See Figure 4.
In the event the fl ow of combustion products through
the boiler venting system becomes blocked, the blocked
vent safety switch will shut the main burner gas off. If
this condition occurs, do not attempt to place the
boiler in operation. Contact a qualifi ed service
agency.
If the boiler fl ue-ways become blocked, a fl ame rollout
safety switch will shut the main burner gas off. If this
condition occurs, do not attempt to place the boiler
in operation. Contact a qualifi ed service agency.
To Clean The Flue Gas Passageways
Remove the burners from the combustion chamber by
1.
raising the burners up from the manifold orifi ces and
pulling toward the front of the boiler. See Figure 5.
Disconnect the vent pipe from the draft hood.
2.
Remove the top jacket panel.
3.
Remove the combination fl ue collector and draft hood
4.
from the boiler castings by loosening the nuts on the
hold down bolts located on each side of the collector.
Place a sheet of heavy paper or similar material over
5.
the bottom of the base and brush down the fl ue
passageways. The soot and scale will collect on the
paper and is easily removed with the paper.
With the paper still in place in the base, clean the top
of the boiler castings of the boiler putty or silicone
used to seal between the castings and fl ue collector.
Make certain that chips are not lodged in the fl ue
passageways.
When the cleaning process is complete, restore the boiler
components to their original position. Use boiler putty
or IS-808 GE silicone (available from the distributor) to
seal around the fl ue collector and boiler castings.
A visual check of the main burner and pilot fl ames
should be made at the start of the heating season and
again mid-season. The main burner fl ame should have a
well defi ned inner blue mantel with a lighter blue outer
mantel. Check the burner throats and burner orifi ces
for lint or dust obstruction. See Figure 6.
GENERAL INSTRUCTIONS
The pilot fl ame should envelop 3/8 to 1/2 inch of the
tip of the pilot thermocouple, ignition/sensing electrode
or mercury sensor. See Figure 7
To adjust the pilot fl ame, remove the pilot adjustment
cover screw and turn the inner adjustment screw
counterclockwise
to decrease pilot fl ame. Be sure to replace cover screw
after adjustment to prevent possible gas leakage.
The burners and pilot should be checked for signs of corro-
sion, rust or scale build-up. The area around the boiler
must be kept clear and free of combustible materials,
gasoline and other fl ammable vapors and liquids.
The free fl ow of combustion and ventilating air to
the boiler and boiler room must not be restricted or
blocked.
It is suggested that a qualifi ed service agency be
employed to make an annual inspection of the boiler
and heating system. They are experienced in making the
inspections outlined above and, in the event repairs or
corrections are necessary, can make the proper changes
for safe operation of the boiler.
6
to increase or clockwise